Small plastic insert to fill the hole in the older style ATLAS car floor (cars were made by ROCO for ATLAS). Enables attaching Weaver or other trucks to car. Sold as a pair, enough for 1 car. *** Normally we mail these instead of sending UPS to addresses in USA...(unless they are ordered with another item). The cost for mailing is about $5 First Class Mail...and $9 Priority Mail. Before we make the final charge to your card we will reduce the amount authorized sown to the correct freight amount.